Matrox VS4 + VS4 Recorder Pro :
Matrox VS4 - is a PCIe x8 Quad HD capture card that allows you to simultaneously
stream and capture from up to four independent SDI video sources using
optional vMix, Wirecast, or the full version of VS4 Recorder Pro
The VS4 features ISO recording, which means that while streaming the
program live the VS4 can also encode video from each input at up to 300
Mb/s, to available video storage. The VS4 features codecs compatible
with editing solutions from Adobe, Avid and Apple, this allows you to go
back and re-edit your show after it has already streamed live.
Supporting 8 channels of embedded audio per input, the card encodes
audio at 24-bit resolution at 48 kHz for clean clear sound. The VS4 is
PC compatible, running on the Windows 7 OS.